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Plant Symposia Plant Symposia P-1 P-3 Remembering Winter: Vernalization as an Environmentally Induced Epi- Diverse Small RNA-directed Pathways in Plants. ZHIXIN XIE. Dept. of genetic Switch. RICHARD AMASINO. Department of Biochemistry, Biological Sciences, Texas Tech University, Lubbock, TX 79409-3131. University of Wisconsin, Madison, WI 53706. Email: amasino@ Email: [email protected] biochem.wisc.edu Most eukaryotic organisms possess highly conserved RNA silencing ma- Certain plants, such as biennials or winter annuals, require relatively long chinery that is associated with the formation of 21- ; 24-nucleotide small periods of cold exposure during winter to initiate ¯owering the following RNAs from precursor RNA molecules containing double stranded struc- spring. Cold exposure renders the meristem of such cold-requiring species tures. These endogenous small RNAs, which include microRNAs (mi- competent to ¯ower, and this acquisition of competence is known as RNAs) and small interfering RNAs (siRNAs) play important roles in vernalization. A vernalization requirement ensures that ¯owering does not regulation of gene expression, maintenance of genome integrity, control occur prematurely before the onset of winter. A similar cold response is of heterochromatin formation, and antiviral defense. Formation or activity bud dormancy; in many species that grow in temperate climates, bud of small RNAs requires factors belonging to gene families that encode dormancy is not broken until a the plant has ``counted'' a suf®cient num- DICER [or DICER-LIKE (DCL)], ARGONAUTE proteins and, in the ber of days of cold to ensure that any subsequent warn weather actually case of some siRNAs, RNA-DEPENDENT RNA POLYMERASE (RDR) indicates that spring has arrived. Our studies of vernalization in Arabi- proteins. Interestingly, unlike many animals, plants encode multiple DCL dopsis have revealed that meristem competence is a function of the ex- and RDR proteins. Recent genetic studies in Arabidopsis revealed that pression level of certain MADS-box genes such as FLOWERING LO- plants have evolved multiple functionally specialized small RNA path- CUS C (FLC) that act as repressors of ¯owering. Exposure to prolonged ways that require distinct DCL and RDR factors. Therefore, plants pro- cold causes an epigenetic switch of these MADS box genes to an unex- vide a unique system to study the evolution, diversi®cation, and func- pressed state, thus rendering the shoot apical meristem competent to ¯ow- tional adaptation of small RNA pathways. Unique functions associated er. This epigenetic switch is caused by covalent modi®cations to histones with distinct DCL and RDR factors in diverse small RNA-directed pro- of the chromatin of the ¯owering repressors. cesses will be presented. P-2 P-4 Role of miRNAs and siRNAs in Abiotic Stress Responses. JIAN-KANG High Throughput Gene Assembly and Expression Using Viral RNA Rep- ZHU. Institute for Integrative Genome Biology and Department of Bot- licons Delivered by Agrobacterium. Y. GLEBA, S. Marillonnet, and V. any and Plant Sciences, 2150 Batchelor Hall, University of California, Klimyuk. Icon Genetics GmbH, Halle/Saale, D-06120, GERMANY. Riverside, CA 92521. Email: [email protected] Email: [email protected] Small non-coding RNAs ranging in size between 20 and 24 nucleotides Plant biotechnology relies on two processes for delivery and expression are important regulators of mRNA degradation, translational repression, of heterologous genes in plants, stable genetic transformation and tran- and chromatin modi®cation. These small RNAs can be broadly classi®ed sient expression with viral vectors or with Agrobacterium, but only the as miRNAs (microRNAs) and siRNAs (short interfering RNAs) based on transient routes provide a speed and a throughput necessary for fast re- their biogenesis. We found that the expression of some miRNAs and search and development studies. We developed an ef®cient, versatile and siRNAs in Arabidopsis plants are regulated by abiotic stresses such as high-throughput vector engineering and expression system based on in drought, soil salinity and cold temperatures. Data on the functional anal- planta assembly of functional viral vectors from separate pro-vector mod- ysis of several miRNAs and siRNAs using mutants and transgenic plants ules. With this system, we use agrobacteria to deliver various DNA mod- will be presented to support the regulatory roles of small RNAs in plant ules that are assembled inside the plant cell with the help of a site-speci®c adaptation to abiotic stresses. recombinase, integrase. The resulting DNA is transcribed, and undesired elements such as recombination sites are spliced out, generating fully functional viral RNA replicons. The proposed protocol allows, by simply treating a plant with a mixture of two or more agrobacteria carrying speci®c prefabricated modules, to rapidly and inexpensively assemble and test multiple vector/gene combinations, without the need to perform var- ious engineering steps normally required with alternative methods. The process described is very fast (3±6 days); it provides very high protein yield (up to 5 mg per g fresh leaf biomass); and it is based on over 250 prefabricated genetic modules that allow to express a speci®c protein by adding speci®c promoters, signal/transit peptides, puri®cation tags, pro- tein fusions, etc., in multiparallel studies. In Vitro Biology Meeting 10-A Abstracts Plant Symposia P-5 P-7 Signaling Networks Controlling Disease Resistance Responses in Ara- In Planta Transcriptional and Functional Patterns of an Agriculturally Rele- bidopsis. J. GLAZEBROOK, Raka Mitra, and Lin Wang. Department of vant R Gene. JAMES M. BRADEEN, B. P. Millett, and D. S. Mollov. De- Plant Biology, University of Minnesota, Saint Paul, MN 55108. Email: partment of Plant Pathology, University of Minnesota, St. Paul, MN 55108. [email protected] Email: [email protected] Plants respond to pathogen attack by activation of a battery of defense Potato late blight disease, caused by Phytophthora infestans, is among the responses. Activation is controlled by a complex regulatory network. Sec- most costly crop diseases worldwide. The disease affects both foliage and tors of this network are commonly de®ned based on the identities of tubers. Breeding efforts to improve potato late blight resistance have led to needed small molecule signals, salicylic acid (SA), jasmonic acid and the hypothesis that foliar and tuber blight resistance is conditioned by different related compounds (JA), and ethylene (ET). Genetic dissection of this resistance (R) genes. Previous research also documents changes in foliar blight resistance throughout plant development, suggesting R gene regulation or signaling network in Arabidopsis has identi®ed major regulatory genes function is dependent on physiological stage. The cloning of the foliar blight involved in these three sectors. A complete understanding of defense gene RB provides tools to test and explore these phenomena. We have de- network topology and function requires genome-scale analysis. To this veloped a highly sensitive RT-PCR assay to examine transgene RB expression. end, we have studied genetic perturbations of the network by transcrip- RB, like many R genes, is one of a cluster of sequence similar but functionally tional pro®ling using whole-genome microarrays. Similarity relationships disparate gene copies. However, our assay differentiates not only between RB among the transcriptional pro®les obtained from key mutants were used paralogs and RB alleles, but even between the RB transgene and the allele to create a basic model of network topology. It is obvious that effective from which it was cloned. We have also optimized whole plant and whole defense requires many regulatory and effector genes which have not yet tuber assays to functionally test for late blight resistance. The potato-P. in- been identi®ed. Many of these genes are expected to show increased festans pathosystem is an ideal system in which to test tissue-speci®c tran- expression in response to pathogen attack. In an effort to identify them, scriptional and functional regulation of R genes, since P. infestans is a natural plants with mutations in pathogen-induced genes have been screened for pathogen of two distinct plant tissues, leaves and tubers. We compared trans- enhanced disease susceptiblity phenotypes. Several important genes have gene RB transcription in foliage and tubers with results of our functional been identi®ed, including a cytochrome P450 monooxygenase required assays. Although the RB transgene is expressed in all plant tissues, leaves of for synthesis of the antimicrobial compound camalexin. transgenic plants are late blight resistant while tubers of transgenic plants are late blight susceptible. In related studies, we are exploring transcriptional and functional regulation of transgene RB throughout plant development. We have compared pre-¯owering, ¯owering, and post-¯owering transgenics using our RT-PCR and foliar blight resistance assays. Our research provides insight into strategies for the integration of transgene RB into potato disease management schemes. Future experiments include exploration of RB protein levels and comparison the disease response transcriptomes in various plant tissues and throughout plant development. P-6 P-8 Pro®les in Scourge: Gene Expression Analysis of a Crop Killer. H. COR- Use of a High-performance, Custom Microarray for Elucidation of Sig- BY KISTLER and Kye-Yong Seong. USDA-ARS, Cereal Disease Lab- naling
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